package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetMealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetMealMapper setMealMapper;

    /**
     * 菜品添加到购物车
     *
     * @param shoppingCartDTO
     */
    @Override
    @Transactional
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断当前菜品/套餐是否已经存在
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        //如果已经存在了，需要要将数量加一
        if (list != null && list.size() > 0) {
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(cart);
        } else {
            //如果不存在，需要插入一条购物车数据
            //判断本次添加到购物车的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if(dishId != null) {
                //本次添加到购物车的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
                shoppingCart.setName(dish.getName());
            }else{
                //本次添加到购物车的套餐
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setMeal = setMealMapper.getSetMealById(setmealId);
                shoppingCart.setImage(setMeal.getImage());
                shoppingCart.setAmount(setMeal.getPrice());
                shoppingCart.setName(setMeal.getName());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }
}